Finding the Fourth Proportional to 1,100.72, 1,518.92 and 634.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.72 : 1,518.92 = 634.80 : x
2. Step 2: Convert to fraction form
   1,100.72/1,518.92 = 634.80/x
3. Step 3: Cross multiply
   1,100.72x = 1,518.92 × 634.80
4. Step 4: Simplify right side
   1,100.72x = 964,210.42
5. Step 5: Solve for x
   x = 964,210.42/1,100.72
6. Step 6: Final answer
   x = 875.98